0.5(12-6x)(12-6x+5x)=48
0.5(12-6x)(12-6x+5x)=48
數(shù)學(xué)人氣：166 ℃時(shí)間：2020-06-25 16:47:48
優(yōu)質(zhì)解答
0.5(12-6x)(12-6x+5x)=48 (12-6x)(12-6x+5x)=96(12-6x)^2+5x(12-6x)-96=0144-144x+36x^2+60x-30x^2-96=06x^2-84x+48=0x^2-14x+8=0x=[14±√(196-32)]/2=[14±2√41]/2=7±√41
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